Ratchet wrench

Abstract

Ratchet wrench has its head comprising an opening, a recess on a wall of the opening, a channel having one end open to the recess and the other blind end in the handle, and a trough on the handle proximate the wrench head, a reversing pawl in the recess and including a top groove and a rear cavity, a push button on the trough adapted to move between first and second positions by cooperating with a spring depressible detent for carrying out clockwise driving and counterclockwise ratcheting or vice versa, a reversing lever having one portion disposed on the groove and the other portion received in a slot of the push button, a spring biaser including one end in the cavity and the other end in the blind end of the channel, and a socket fastened in the opening and being meshed with pawl teeth of the reversing pawl.

1. A ratchet wrench comprising:
 a handle; 
 a head section integrally formed with the handle, the head section comprising a circular opening, a recess formed on a wall of the opening aligned with the handle, an internal channel having one end in communication with the recess and the other blind end in the handle, and a trough disposed on a joining portion of the handle and the head section; 
 a reversing pawl provided in the recess and comprising a top groove, a cavity formed on a center of an internal arc surface thereof, and external pawl teeth; 
 a push button slidably provided on the trough and comprising a tapered, knurled top projected above the handle, a front slot, and first and second dents on its bottom; 
 a spring depressible detent having one end anchored on the trough and the other end moveably disposed in either the first dent or the second dent; 
 a reversing lever partially provided on the groove and partially received in the slot, the reversing lever comprising oblique, opposite sides either being adapted to snugly engage with either mating side of the groove; 
 a biaser comprising one end provided in the cavity, the other end provided in the blind end of the channel, and a resilient device biased against both ends thereof; and 
 a socket fastened in the opening and comprising external ratchet teeth meshed with external pawl teeth of the reversing pawl and internal drive teeth; 
 whereby pushing the push button to a first direction will pivot the biaser toward the first direction relative to the channel, move the other end of the detent from the first dent to the second dent, engage one side of the reversing lever with one side of the groove and disengage the other side thereof from the other side of the groove, mesh a substantially first half portion of the external pawl teeth of the reversing pawl with the external ratchet teeth of the socket, urge a substantially first half portion of the internal arc surface of the reversing pawl against a wall of the recess, enable a clockwise driving of the ratchet wrench with respect to a member engaged with the internal drive teeth of the socket, and carry out a counterclockwise ratcheting of the ratchet wrench; and 
 whereby pushing the push button to a second direction opposite the first direction will pivot the biaser toward the second direction relative to the channel, move the other end of the detent from the second dent to the first dent, engage the other side of the reversing lever with the other side of the groove and disengage one side thereof from one side of the groove, mesh a substantially second half portion of the external pawl teeth of the reversing pawl with the external ratchet teeth of the socket, urge a substantially second half portion of the internal arc surface of the reversing pawl against the wall of the recess, enable a counterclockwise driving of the ratchet wrench with respect to a member engaged with the internal drive teeth of the socket and carry out a clockwise ratcheting of the ratchet wrench. 
 
   
   
     2. The ratchet wrench of  claim 1 , wherein one end of the biaser is formed as a half spherical head provided in the cavity the other end of the biaser is formed as a ball engaged with the blind end of the channel, the ball having an aperture facing the resilient device, and the resilient device comprises a bar extended from the half spherical head of the biaser, and a compression spring put on the bar, rear portions of both the compression spring and the bar being disposed in the aperture.